Stroke volume estimation by thoracocardiography is better when glottis is closed

TL;DR

This study evaluates how the accuracy of stroke volume estimation via thoracocardiography is affected by glottis state, finding improved estimates when the glottis is closed.

Contribution

It introduces a comparison of stroke volume estimation accuracy with open versus closed glottis during thoracocardiography.

Findings

Better stroke volume estimates when glottis is closed

Airway flow curves improve estimation accuracy with open glottis

Thoracocardiography effectiveness varies with glottis state

Abstract

Thoracocardiography approach pretends to non-invasively monitor stroke volume by inductive plethysmographic recording of ventricular volume curves by a transducer placed on the chest. The purpose of this study was to investigate the potential of thoracocardiography to estimate stroke volumes while apnea with open glottis. We hypothesized that, when glottis is open, stroke volumes would be better estimated if airways flow curves were taken into account.